Patent application number | Description | Published |
20110034739 | CATALYST AND PROCESS FOR PREPARING SATURATED ETHERS BY HYDROGENATING UNSATURATED ETHERS - The invention relates to a supported catalyst based on palladium-γ-alumina, which is characterized in that the catalyst support material contains 1 to 1000 ppm by mass of sodium oxide and has a specific pore volume of 0.4 to 0.9 ml/g and a BET surface area of 150 to 350 m | 02-10-2011 |
20110105791 | PROCESS FOR PREPARING ACRYLIC ACID PURIFIED BY CRYSTALLIZATION FROM HYDROXYPROPIONIC ACID AND APPARATUS THEREFORE - The invention relates to a process for the preparation of acrylic acid and a process for the preparation of polyacrylic acid comprising the process steps: (a1) preparation of 3-hydroxypropionic acid from a biological material to give a fluid, in particular aqueous, phase containing 3-hydroxypropionic acid; (a2) dehydration of the 3-hydroxypropionic acid to give a fluid, in particular aqueous, solution containing acrylic acid; (a3) purification of the solution containing acrylic acid by a suspension crystallization or a layer crystallization to give a purified phase; and corresponding devices for carrying out these processes, and acrylic acid and polyacrylates. The invention is distinguished in that acrylic acid and polyacrylates can thereby be prepared efficiently, inexpensively, and sustainably with simple means and with a high purity on the basis of regenerable raw materials. | 05-05-2011 |
20110144294 | WATER-ABSORBING POLYMER STRUCTURES BASED ON RENEWABLE RAW MATERIALS AND PROCESS FOR THEIR PRODUCTION BY DEHYDRATION - The present invention relates to a process for production of acrylic acid, comprising at least the following steps:
| 06-16-2011 |
20110182796 | METHOD FOR THE PYROLYSIS OF CARBOHYDRATES - The present invention relates to methods for the technical pyrolysis of a carbohydrate or carbohydrate mixture at an elevated temperature while adding silicon oxide, to a pyrolysis product obtainable in this way, and to the use thereof as a reducing agent for the production of solar silicon from silicic acid and carbon at a high temperature. | 07-28-2011 |
20110189072 | PROCESS FOR PREPARING HIGHER HYDRIDOSILANES - Process for preparing higher hydridosilanes of the general formula H—(SiH | 08-04-2011 |
20110262336 | PRODUCTION OF SOLAR-GRADE SILICON FROM SILICON DIOXIDE - The invention relates to a complete method for producing pure silicon that is suitable for use as solar-grade silicon, comprising the reduction of a silicon oxide, purified by acidic precipitation from an aqueous solution of a silicon oxide dissolved in an aqueous phase, using one or more pure carbon sources, the purified silicon oxide being obtained, in particular, by the precipitation of a silicon oxide dissolved in an aqueous phase in an acidifier. The invention also relates to a formulation containing an activator and to a device for producing silicon, a reactor and electrodes. | 10-27-2011 |
20110262339 | PRODUCTION OF SOLAR-GRADE SILICON FROM SILICON DIOXIDE - The invention relates to a complete method for producing pure silicon that is suitable for use as solar-grade silicon, comprising the reduction of a purified silicon oxide using one or more pure carbon sources, the purified silicon oxide, which was purified as silicon oxide dissolved in an aqueous phase, having a content of other polyvalent metals or metal oxides, in relation to the silicon oxide, of less than or equal to 300 ppm, preferably less than 100 ppm, especially preferably less than 50 ppm and according to the invention less than 10 ppm of the other metals and being obtained advantageously by gel formation in alkaline conditions. The invention also relates to a formulation containing an activator and to the use of purified silicon oxide together with an activator for producing silicon. | 10-27-2011 |
20110268642 | PROCESS FOR PURIFYING LOW MOLECULAR WEIGHT HYDRIDOSILANES - The present invention relates to a process for purifying low molecular weight hydridosilane solutions, in which a solution to be purified comprising a) at least one low molecular weight hydridosilane, b) at least one solvent and c) at least one impurity selected from the group of the compounds having at least 20 silicon atoms and/or the group of the homogeneous catalyst systems is subjected to a crossflow membrane process with at least one membrane separation step using a permeation membrane. | 11-03-2011 |
20110275777 | METHOD FOR PRODUCING ACROLEIN COMPRISING THE REGENERATION OF A RAW GLYCERIN PHASE - The invention relates to a method for producing acrolein, comprising the following steps: (a) dehydrating an aqueous glycerin phase G1 in an acrolein reaction region, obtaining an aqueous acrolein reaction phase; (b) at least partially separating the aqueous acrolein reaction phase into an acrolein-rich acrolein phase and an acrolein-poor (in comparison to the acrolein phase) residual phase R1, wherein the residual phase R1 comprises glycerin, water and various remainders from glycerin and water; (c) recycling at least a part of the residual phase R2 in step (a); wherein i) from a glycerin phase G2 comprising remainders that differ from glycerin and water, at least one of said remainders is separated and the thus obtained, purified glycerin phase G2 is immediately supplied to the acrolein reaction region, or ii) at least one remainder different from glycerin and water is separated out of a mixture phase M1 obtained by mixing a glycerin phase G2 with the acrolein-poor residual phase R1, and the thus obtained, purified mixture phase M1 is supplied to the acrolein reaction region. The invention furthermore relates to a method for producing acrylic acid, water-absorbing polymer formations, compounds and hygiene articles, to devices for carrying out the method and their application, to a method for purifying a glycerin phase and to the application of a glycerin phase. | 11-10-2011 |
20120232233 | SUPERABSORBENT POLYMERS AND METHODS OF MAKING THE SAME - In one aspect, a process for the preparation of a superabsorbent polymer is described herein. In some embodiments, the process comprises (I) preparing acrylic acid, wherein the process comprises (a | 09-13-2012 |
20120263639 | PROCESS FOR PREPARING HIGHER HYDRIDOSILANES - The invention relates to a method for producing higher hydridosilane wherein at least one lower hydridosilane and at least one heterogeneous catalyst are brought to reaction, wherein the at least one catalyst comprises Cu, Ni, Cr and/or Co applied to a carrier and/or oxide of Cu, Ni, Cr and/or Co applied to a carrier, the hydridosilane that can be produced according to said method and use thereof. | 10-18-2012 |
20130053522 | SUPERABSORBENT POLYMERS AND METHODS OF MAKING THE SAME - In one aspect, a process for the preparation of a superabsorbent polymer is described herein. In some embodiments, the process comprises (I) preparing acrylic acid, wherein the process comprises (a1) provision of a fluid F1 having a composition comprising from about 5 to about 20 wt. % of hydroxypropionic acid, salts thereof, or mixtures thereof; from about 0.1 to about 5 wt. % of inorganic salts; from about 0.1 to about 30 wt. % of organic compounds which differ from hydroxypropionic acid; from 0 to about 50 wt. % of solids; and from about 20 to about 90 wt. % of water; (a2) dehydration of said hydroxypropionic acid to give a fluid F2 containing acrylic acid; and (a3) purification of said fluid F2 to give a purified acrylic acid phase comprising acrylic acid having a purity of at least 70 wt. %; and (II) polymerizing the acrylic acid of (I) to form a superabsorbent polymer. | 02-28-2013 |
20130078176 | FLOW TUBE REACTOR FOR CONVERSION OF SILICON TETRACHLORIDE TO TRICHLOROSILANE - The invention relates to a method for converting silicon tetrachloride having hydrogen to trichlorosilane in a hydrodechlorination reactor, wherein the hydrodechlorination reactor is operated under pressure and comprises one or more reactor tubes which are made of a ceramic material. The invention further relates to the use of such a hydrodechlorination reactor as an integral component of a system for producing trichlorosilane from metallurgical silicon. | 03-28-2013 |
20130095026 | CLOSED LOOP PROCESS FOR PREPARING TRICHLOROSILANE FROM METALLURGICAL SILICON - The present invention relates to a multistage process for preparing trichlorosilane and silicon tetrachloride from metallurgical silicon, in which trichlorosilane and silicon tetrachloride are prepared from metallurgical silicon in a first step, and the silicon tetrachloride is processed further to the trichlorosilane end product in a second step. The present invention further relates to a plant in which such processes can be performed in an integrated manner. | 04-18-2013 |
20130099164 | USE OF A PRESSURIZED CERAMIC HEAT EXCHANGER AS AN INTEGRAL PART OF A PLANT FOR CONVERTING SILICON TETRACHLORIDE TO TRICHLOROSILANE - The invention relates to the use of a ceramic heat exchanger as an integral part of a process for catalytic dehalogenation of silicon tetrachloride to trichlorosilane in the presence of hydrogen, wherein the product gas and the reactant gases are conducted as pressurized streams through the heat exchanger, and the heat exchanger comprises heat exchanger elements made from ceramic material. | 04-25-2013 |
20130216464 | CATALYTIC SYSTEMS FOR CONTINUOUS CONVERSION OF SILICON TETRACHLORIDE TO TRICHLOROSILANE - The invention relates to an improved method for converting silicon tetrachloride having hydrogen in a hydrodechlorination reactor comprising a catalyst. The invention further relates to a catalytic system for such a hydrodechlorination reactor. | 08-22-2013 |
20130224098 | USE OF A REACTOR WITH INTEGRATED HEAT EXCHANGER IN A PROCESS FOR HYDRODECHLORINATING SILICON TETRACHLORIDE - The invention relates to a method for converting silicon tetrachloride by means of hydrogen to form trichlorosilane in a modified hydrodechlorination reactor. The invention further relates to a the use of such a modified hydrodechlorination reactor as an integrated component of a system for producing trichlorosilane from metallurgical silicon. | 08-29-2013 |
20130253149 | SUPERABSORBENT POLYMERS AND METHODS OF MAKING THE SAME - In one aspect, a process for the preparation of a superabsorbent polymer is described herein. In some embodiments, the process comprises (I) preparing acrylic acid, wherein the process comprises (a1) provision of a fluid F1 having a composition comprising from about 5 to about 20 wt. % of hydroxypropionic acid, salts thereof, or mixtures thereof; from about 0.1 to about 5 wt. % of inorganic salts; from about 0.1 to about 30 wt. % of organic compounds which differ from hydroxypropionic acid; from 0 to about 50 wt. % of solids; and from about 20 to about 90 wt. % of water; (a2) dehydration of said hydroxypropionic acid to give a fluid F2 containing acrylic acid; and (a3) purification of said fluid F2 to give a purified acrylic acid phase comprising acrylic acid having a purity of at least 70 wt. %; and (II) polymerizing the acrylic acid of (I) to form a superabsorbent polymer. | 09-26-2013 |
20140086815 | USE OF SILICON CARBIDE TUBES WITH A FLANGED OR FLARED END - The invention relates to the use of a ceramic tube composed of silicon carbide variants in processes for converting chlorosilanes, wherein the tube has a flange or a flare at one end and is closed at the other end. | 03-27-2014 |
20140086816 | USE OF BURNERS WITH A JET TUBE IN REACTORS FOR CONVERSION OF CHLOROSILANES - The invention provides for the use of a particular burner design to heat reactors for conversion of chlorosilanes, wherein the burner has a jet tube and the jet tube surrounds the flame and the flame tube in a gastight manner, as a result of which the combustion air, the gaseous and/or liquid fuels, and also the flue gases cannot get into the reaction furnace space. The advantage is the complete separation of the flue gas from the actual interior of the reaction furnace, which prevents critical interactions between flue gas moisture and chlorosilanes in the case of fracture of the arrangement accommodating the chlorosilanes. This in turn makes it possible to use gaseous or liquid fuels to heat such a reaction furnace. Excessive local input of heat as a result of direct flame contact is prevented; the heat input is homogenized. | 03-27-2014 |
20140178283 | HYDROGENATION OF ORGANOCHLOROSILANES AND SILICON TETRACHLORIDE - The invention relates to a process for preparing trichlorosilane, characterized in that hydrogen and at least one organic chlorosilane are reacted in a reactor which is operated under superatmospheric pressure and comprises one or more reactor tubes which consist of a gastight ceramic material. | 06-26-2014 |
20140212352 | INTEGRATED PROCESS FOR CONVERSION OF STC-CONTAINING AND OCS-CONTAINING SIDESTREAMS INTO HYDROGEN-CONTAINING CHLOROSILANES - The invention relates to a process for producing a product gas mixture containing hydrogen-containing chlorosilanes within an integrated process by hydrogenating integrated process by-product silicon tetrachloride and organochlorosilane, more particularly methyltrichlorosilane, with hydrogen in a pressurized hydrogenation reactor comprising one or more reaction spaces each consisting of a reactor tube of gastight ceramic material, wherein the product gas mixture is worked up and at least a portion of at least one product of the product gas mixture is used as starting material for the hydrogenation or as starting material for some other process within the integrated process. The invention further relates to an integrated system useful for practising the integrated process. | 07-31-2014 |
20140286848 | Reactor Design for Reacting Organochlorosilanes and Silicon Tetrachloride to Obtain Hydrogen-Containing Chlorosilanes - The invention relates to a process for producing hydrogen-containing chlorosilanes by reducing Si-based deposits of solid material during the operation of a pressurised reactor comprising one or more reaction spaces, wherein at least one organochlorosilane is reacted with hydrogen in at least one of these reaction spaces for at least some of the time, characterized in that at least one of the optionally two or more reaction spaces in which this reaction takes place is supplied with additional HCl for at least some of the time. The additional HCl is preferably produced by hydrodehalogenation of silicon tetrachloride with hydrogen in at least one of the optionally two or more reaction spaces of the reactor. | 09-25-2014 |